Thread-bender for sewing-machines.



P. SJOSTROM.

THREAD BENDER FOR SEWING MACHINES.

APPLICATION FILED MAY 13. 1915.

1 ,1 90,200. I Patented July 4, 1916.

4 SHEETS-SHEET I.

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P. SJOSTROM. THREAD BENDER FOR SEWING MACHINES.

APPLICATION FILED MAY 13, I9I5- MMW a d w H w r w m w @w m W L P. SJOSTROM.

THREAD BENDER FOR SEWING MACHINES.

APPUCATION FILED MAY 13, i915.

1,1 90,200. Patented July 4, 1916.

4 SHEETS-SHEET 3.

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P. SIOSTROMQ THREAD BENDER FOR SEWING MACHINES.

APPLICATION FILED MAY13 I915.

Patented July 4, 1916.

4 SHEETS-SHEET 4- Wbnwses: Wanker: I fC W .Peker ,'jbsb'mw,

PETER SJ OSTROM, 0F MAPLEWOOD, MASSACHUSETTS, ASSIGNOR TO VICTOR SHOE MACHINERY COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION 'OF MASSACHUSETTS.

THREAD-BENDER FOR SEWING-MACHINES.

Specification of Letters Patent.

' Patented July 4, 1916.

Original application filed February 17, 1915,"Seria1 No. 9,465. I Divided and. this application filed May 13,

To all whom it may concern: 7

Be it known that I, PETER SJosTRoM, a subject of the King of Sweden, and a resident of Maplewood, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Thread-Benders for Sewing-Machines, of which the following is a specification.

This invention relates to machines for sewing heavy material such as leather and particularly to that class of machines known as welt sewing machines, and is a division of an application filed by me Feb. 17, 1915, and numbered 9,465.

The object of the present invention is to provide a new and improved mechanism for placing the thread upon the barb of the needle during the stitch forming operation.

The invention consists features of construction and'arrangement of parts which will be fully understood by reference to the description of the drawings and to the claims hereinafter given.

Of the drawings: Figure 1 represents a front elevation of a sewing machine embodying the principles of the present invention. Fig. 2 represents a left end elevation of the same. Fig. 3 represents a vertical section of the same, the cutting plane being'on line 7 3-3 on Fig. 1. Fig. 4 represents a horizontal section of a portion of the same, the cutting plane being on line 4-4 on Fig. 3. Fig. 5 represents a plan-of the thread bending mechanism with the thread bending plate in its normal position. Fig. 6 represents an elevation of the same. Fig. 7 represents a similar view with the thread bending plate in position to deposit the thread on the barb of the needle, and Fig. 8 represents a plan of the same.

Similar characters designate like .parts throughout the several figures of the drawln s.

Tn the drawings, 19 is a connector, the lower end of which is connected to any wellknown form of driving mechanism, while the upper end is pivotally connected to a lever 20 loosely mounted upon a stud 21 nonrevolubly mounted in a boss 22 formed upon the frame 23, the base 24 of which is adapted to be secured to any well-known form of support. The lever 20 is secured of certain novel- Serial No. 28,496.

by means of the bolt 26 to the gear segment 27, the hub 28 of which is mounted on the stud 21 about the axis of which it is adapted to be oscillated. The hub 28 is preferably provided with a reduced cylindrical eXtenslon pro ecting through the hub of the lever 20 as shown in Fig. 2. The teeth of the gear segment 27 mesh with the teeth of the gear 29 secured to a shaft 30 mounted in bearings n the frame 23, in which bearings said shaft 1s adapted to be oscillated by means of the gear segment 27. During the oscillation of the gear segment 27 the lever 20 moves through an arc of a circle.

The shaft 30 has loosely mounted thereon a disk member 31 having formed thereon radial shoulders 3233 which are adapted to be engaged by a pin 34 extending laterally from the gear 29. This pin 34, during the oscillation of the gear 29, will impart movement to the disk 31 when contacting with either of the shoulders 3233, while permitting said disk to remain at a standstill at the beginning of the movement of saidvpin 34 ineither direction, that is, while traveling from the shoulder 32 to the shoulder 33 or vice versa.

tion 35 adapted to engage the truck 36 on a lever 37 pivoted at 38 to the frame 23, the opposite. end of said lever 37 being provided with a bearing member 39 adapted to engage the awl carrier 40 when it is desired to feed the work. The awl carrier 40 is provided with the usual curved awl 41. The

truck 36 is retained normally in contact with the cam 35 by the spring 37 x which forces the front end of the lever 37 outwardly, 1 this outward movement being limited by the stop pin 38*.

The work feeding mechanism is fully described in the application No. 9,465, hereinbefore referred to, and to which reference may be made for a better understanding of the operation thereof.

The machine is also provided with the usual needle carrier 45 in which is mounted the barbed needle'47 and the presser foot carrier 58 pivoted at 51 and having secured thereto the presser foot 59. The operation of the presser foot forms no part of the present invention and is not herein described.

The threadT passes from the source of supply through suitable thread measuring and locking devices to the wax pot 89 clamped to the frame 23 in any well-known manner. To an inner face of the wax pot 89 is secured a plate 93 having mounted thereon at its lower end a roll 94 partially around which the thread T passes, said thread then passing upwardly through the stripper 95 which serves toremove from the thread the surplus wax. The thread then passes to a roll 96 mounted upon the frame 23 from which roll the thread passes to an inner roll 97 mounted upon the thread takeup lever 98, said lever being also provided with an outer thread roll 99 to which the thread passes from the inner roll 97. Intermediate the rolls 97 and 99 and mounted upon the frame 23 is a roll 100 over which the thread T is adapted to pass when the takeup lever 98 is in its lowest position. This takeup lever 98 is pivoted to the stud 21 by the screw 101 and at 102 has pivoted thereto a curved connector 103, the upper end of which is pivoted at 104 to a cam disk 105 mounted upon and movable with the shaft 30. This connector 103 is provided with a recess 106 thewalls of which are adapted to partially inclose the shaft 30 during the operation of the machine. The cam 105 is provided with a cam path 107 in which is positioned a truck 108 mounted upon the rear end of a lever 109 pivotally -mounted upon a stud 110. This stud 110 is mounted in a bearing in the frame 23 and extends beyond the outer face of said frame, having mounted upon its outer end an ad justing nut 111 between which and the outer face of said frame 23 is spring 112 tending to retain the face 113 of the lever 109 in frictional contact with the inner face of the frame 23 so that said lever 109 will remain in any position in which it may be placed until positively acted upon by means of one of the walls of the cam path 107. The lever 109 is provided with an upwardly extending arm 114, the upper end of which is provided with a bearing in which is mounted a cylindrical shank 114*, the front end of which has formed thereon a plate 115 having two thread engaging fingers 116 projecting therefrom. The rear end of the cylindrical shank 114 has pinned thereto an operating arm 117. The finger plate 115 is located just beneath the work support 118 which is pro;- vided with the usual slot 119 through which the awl and needle pass during the stitch forming operation. Extending downwardly from the work support 118 is a thread guard 120 secured at its lower end to the frame 23. On the rear face of the thread guard 120 is a roll 121 over which the thread T passes from the roll 99 on its way to and through the slot 119 in the work support 118.

The thread guard 120 has projecting rear- Wardly from its rear face the two fingers 122 with which the thread T contacts as it passes from the roll 121 to the work. To the hub of the lever 109 is secured a spring finger 123 the upper end of which is positioned between the projecting fingers 122. This spring member 123 is so constructed that when the lever 109 is moved forwardly about its pivot the end thereof between the fingers 122 will come into contact with the thread T at this point and force it against the rear face of the thread guard, thereby creating sufficient friction thereon as to grip the thread and prevent further movement thereof under normal conditions. The cam path 107 is so constructed that as the cam disk 105 is moved from the position indicated in Fig. 3 of the drawings in a direction indicated by the arrow 0 on said figure there will be no movement of the thread engaging lingers 116 while the roll 108 is moving to the end of said groove. hen, however, the cam moves in the opposite direction and the roll 108 passes up the first incline 200 to the intermediate concentric portion 201 of the inner wall of the groove 107, the fingers 116 will be moved slowly forward to engage the thread T, after which the lever 109 will come to a standstill while the roll 108 ison said intermediate concentric portion 201 of the inner wall of the groove and atthis time the needle 47 will pass downwardly to its lowest position. The finger plate 115 will then be moved about the axis of the shank 114 by means to be hereinafter explained, into the position shown in Figs. 7 and 8, thus causing the thread to be bent with a portion thereof in a substantially horizontal position. Then in the continued movement of the cam 105 the second incline 202 in the inner wall of the groove 107 will act upon'the roll 108 to move it farther from the axis of the shaft 30. This movement will cause the upper end of the arm 114 of the lever 109 to be moved farther forward so that the horizontal por tion of the bent thread will be in the path of the barb of the needle and will be seized thereby as the needle 47 moves upwardly (see Fig. 8).

The cam groove 107 has an enlarged portion therein which is formed by making its outer wall 124 concentric to the axis of the shaft 30 from the upper end of said groove to a point opposite the forward end of the intermediate concentric portion 201 of the inner wall of said groove.

The fingers 116 are spaced apart sufli ciently to take up enough slack in the thread during the bending operation to form the loop that is to be drawn through the work, thereby preventing any drawing of the thread over the barb of the needle, which is liable'to weaken and otherwise injure the thread. The lever 109 will remain at a standstill while the roll 108 is on the outer con centric portion 203 of the inner wall of the groove 107. During the reverse movement of the cam 105, that is, when it is moving. in the direction of the arrow Q, on Fig. 3 of the drawings, the truck 108 remains at a standstill in contact with the wall 124, while the needle is drawing the thread into the stock,

thus preventing the disengagement of the thread from the barb of the needle, and a continued movement of the cam in this direction will return the lever 109 and its supporting members to their normal positions as the roll 108 passes up the incline 204 in the outer wall of the groove 107. The finger plate 115 is operated at a predetermined time by a blade 125 secured to the needle carrier 45 coming into contact with the arm 117 until the thread has been bent horizontally and seized by the barb of the needle 47. When the thread has been seized by the needle and has been moved upwardly into the work, the blade 125 is removed from contact with the arm 117 and a spring 126 secured to the opposite end of said arm 117 returns said arm to its normal position preparatory to another operation. The cam disk 105 has also pivotally connected thereto at 105* one end of a curved connecting member 106*, the opposite end of which is articulated to an arm 45 extending upwardly from the needle carrier 45, said carrier 45 having oscillatory movement imparted to it through the connector 106 by the oscillation of the cam 105. of thread drawn from the source of supply will be taken up during the downward move ment of the takeup lever 98 and when this lever 98 moves upwardly there will be a given amount of slackness inthe thread T between the roll 100'and the roll 99 and there will be no tension upon the under thread when the stitch forming operation occurs. This slackness in the thread T is taken up when the thread is being drawn over the highest point of the shuttle. As the needle 47 passes down through the work the thread bender 115 will be moved forward and the blade 125 will strike the arm 117 and cause the fingers 116 to engage the thread T and'bend it into asubstantially horizontal position. The thread bender 115 will then be moved farther forward so that the thread T will bear against the inside of the needle, as shown in Fig. 8 of the drawings, thus insuring the thread being seized by the barb of the needle as said needle moves upwardly through the work. During this thread bending operation the spring member 123 is "in engagement with the thread T at a point intermediate the two rearwardly extending fingers 122 on the thread guard 120. As has been previously described, when the blade 125 moves upwardly with the needle carrier 45, the spring 126 will return the thread bender 115 to its nor- The amount mal position as indicated in Fig. 11 of the drawings.

It is believed that the operation and many advantages of this machine will be fully understood from the foregoing description.

Having thus described my invention, I claim:

1. In a machine of the class described, the combination of an oscillating needle carrier; a barbed needle therein; a work support provided with a slot through which the thread extends from the work to the source of supply; an oscillating member having two separated fingers adapted to engage the thread on opposite sides thereof and then oscillate about its axis and bend the portion of thread between said fingers into a horizontal position; and means for advancing said oscillating member to cause the horizontal portion of thread to contact with the needle while the latter is near its lowest position whereby the thread will be seized by the needle barb during its upward movement.

2. In a device of the class described, the combination of an oscillating needle carrier; a barbed needle therein; a work support provided with a slot through which the thread extends fromthe work to the source of supply; and an oscillating member provided with two fingers parallel with the axis about which said member oscillates, said fingers being adapted to straddle the thread and during the oscillation of said member bend a portion of said thread horizontally in position to be seized by the barb of the needle during its upward movement.

3. In a device of thejclass described, the combination of an oscillating needle carrier; a barbed needle therein; a work support provided with a slot through which the thread extends to the source of supply; an oscillating forked member beneath the work support provided with two fingers parallel with the axis about which said. member oscillates, said fingers being adapted to straddle the thread and during the oscillation of said member bend a portion of said thread into position tobe seized by the barb of the needle during its upward movement; and means for subsequently advancing said member toward the needle.

4. In a device of the class described, the combination of an oscillating needle carrier; a barbed needle therein; a work support provided with a slot through which the thread extends to the source of supply; an oscillating forked member beneath the work support adapted to straddle the thread and bend a portion thereof into position to be seized by the barb of the needle during its upward movement; and means carried by the needle carrier for effecting the oscillation of said forked member at a predetermined time. Y 7

all

5. In a device of the class described, the combination of an oscillatlng needle carrler; a barbed needle therein; a work support provided with a slot through which the thread extends to the source of supply; a forked member adapted to straddle the thread and having a cylindrical shank in a bearing; an .arm secured to the opposite end of the shank; and means on said needle carrier for engaging said arm and causing said forked member to bend said thread horizontally in the path of the barb of the needle in its upward movement.

6. In a device of the class described, the combination of an oscillating needle carrier; a barbed needle therein; a work support provided with a slot through which the thread extends to the source of supply; a forked member adapted to straddle the thread and having a cylindrical shank in a bearing; an arm secured to the opposite end of the shank; means on said needle carrier for engaging said arm and causing said forked member to bend said thread horizontally in the path of the barb of the needle in its upward movement; and a spring for returning said arm and member to their normal position.

7. In a device of the class described, the combination of an oscillating needle carrier; a barbed needle therein; a work support provided with a slot through which the thread extends to the source of supply; .a cam controlled lever; a forked member adapted to straddle the thread and having a cylindrical shank in a bearing in said lever;-

an arm secured to the opposite end of the shank; means on said needle carrier for engaging said arm and causing said forked member to bend said thread horizontally in the path of the barb of the needle in its up ward movement; and a spring for returning said arm and member to their normal position.

8. In a device of the class described, the combination of an oscillating needle carrier; a barbed needle therein; a work support provided with a slot through which the thread extends to the source of supply; a forked member adapted to straddle the thread and having a cylindrical shank in a bearing; an arm secured to the opposite end of the shank; means on said needle carrier for engaging said arm and causing said forked member to bend said thread hori- Zontally in the path of the barb of the needle in its upward movement; and means for moving said forked member toward and from the front of the machine at a predetermined time.

9. In a device of the class described, the combination of stitch forming mechanism; a thread takeup lever; an oscillating disk; a connector between said disk and lever; inner and outer thread rolls on said lever; a wax pot; a thread roll therein; a revoluble roll located above said wax pot over which the thread passes from said wax pot to said inner roll and thence over the outer roll to the Work; a thread guard having tWo rearwardly extending fingers over which the thread passes to the work; a pivoted lever; mechanism thereon for positioning the thread to be engaged by the barb of the needle; and means on said lever for creating a friction on said thread prior to the operation of said thread placing mechanism.

10. In a device of the class described, the combination of a stitch forming mechanism; a thread takeup lever; an oscillating disk; a connector between said disk and lover; inner and outer thread rolls on said lever; a wax pot; a thread roll therein; a revoluble roll located above said wax pot over which the thread passes from said wax pot to said inner roll and thence over the outer roll to the work; a thread guard having two rearwardly extending fingers over which the thread passes to the work; a pivoted lever; mechanism thereon for positioning the thread to be engaged by the barb of the needle; and a member on said lever with its end interposed between said fingers for creating a friction on said thread prior to the operation of said thread placing mechanism.

11. In a device of the class described, the

combination of a stitch forming mechanism;

a thread takeup lever; an oscillating disk; a connector between said disk and lever; inner and outer thread rolls on said lever; a wax pot; a thread roll therein; a revoluble roll located above said wax pot over which the thread passes fromsaid Wax pot to said inner roll and thence over the outer roll to the work; a thread guard having. two rear wardly extending fingers over which the thread passes to the work; a pivoted lever; mechanism thereon for thread to be engaged by the barb of the needle; and a member on said lever with its end inte'posed between said fingers and adapted during the movement of said lever to force said thread into engagement with the thread guard and create a friction thereon.

12. In a device of the class described, the combination of an oscillating barbed needle; mechanism for placing the barb thereof; a needle carrier; an arm thereon for operating said thread placing mechanism at a predetermined time; and a device for creating a friction upon the thread prior to the operation of said thread placing mechanism.

13. In a device of the class described, the combination of an oscillating barbed needle; a mechanism for creating a bend in the thread and placing it upon the barb thereof;

positioning the thread upon the a needle carrier; an arm thereon for operating said thread placing mechanism at a predetermined time; and a device for creating a friction upon the thread prior to the opera tion of said thread placing mechanism.

14:. In a device of the class described, the combination of an oscillating needle; a carrier therefor; an arm secured thereto; a pivoted cam controlled lever having a bearing in its outer end; an oscillating member in said bearing; a lever thereon in the path of said arm whereby said oscillating member will be oscillated during the movement of the needle carrier; and two thread engaging fingers on said oscillating member adapted to bend the thread across the path of said needle in position to be deposited thereon during its upward movement.

15. In a device of the class described, the combination of an oscillating needle; a carrier therefor; an arm secured thereto; a pivoted cam controlled lever having a bearing in its outer end; an oscillating member in said bearing; a lever thereon in the path of said arm whereby said oscillating member will be oscillated during the movementof the needle carrier; two thread engaging fingers on said oscillating member adapted to bend the thread across the path of said needle in position to be deposited thereon during its upward movement; and means carried by said pivoted lever for creating a friction upon the thread prior to the operation of said thread engaging fingers.

16. In a device of the class described, the combination of an oscillating needle; a carrier therefor; an arm secured thereto; a pivoted cam controlled lever having a bearing in its outer end; an oscillating member in said bearing; a of said arm whereby said oscillating member will be oscillated during the movement of Copies 01 this patent may be obtained for five lever thereon in the path I the needle carrier; two thread engaging fingers on said oscillating member adapted to bend the thread across the path of said needle in position to be deposited thereon during its upward movement; a 7 thread guard having two rearwardly engaging projections under which the thread passes to the Work; and means carried by said pivoted lever coacting with said projections to force the thread against said guard and thereby create a friction thereon.

17. In a machine of the class described, the combination of stitch forming mechanism including in part a barbed needle; means for bending the under thread in position to be seized by said needle in its upward movement; a work support; a guard adjacent said work support; and means interposed between said bending means and said guard to grip the under thread during the bending operation.

18. In a device of the class described, the combination of an oscillating needle; a pivoted lever; a truck at one end thereof; a device for placing the thread upon the barb of the needle mounted upon the opposite end of said lever and adapted to oscillate in a bearing therein; means separated from said lever for operating said thread placing device; and a cam member having a cam groove therein to receive said truck, said cam groove having an enlarged portion therein, the opposite walls of which operate on said truck during the movement of said cam member in opposite directions.

Signed by me at 4 Post Oflice Square, Boston, Mass, this 10th day of May, 1915.

PETER SJ OSTROM.

Witnesses:

WALTER E. LoMBARn, NATHAN C. LOMBARD.

cents each, by addressing the Commissioner of Patents.

Washington, D. 0. 

